Reference for Yevamot 203:7

ה"ה דאפילו לכתחלה ואיידי דבעי למיתני סיפא באנפיליא חליצתה פסולה דאפילו דיעבד תנא נמי רישא דיעבד

implies validity only] after the action had been performed but not ab initio. — The same law<span class="x" onmousemove="('comment',' That the halizah is valid. ');">¹³</span> is applicable even [where the shoe was used] ab initio. As, however, it was desired to state in the final clause: BUT IF WITH A SOCK IT IS INVALID, [a law] which applies even after the action had been performed, a similar expression<span class="x" onmousemove="('comment',' Lit., 'which has been done'. ');">¹⁴</span> was also used in the first clause.

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